Production still from "Barry McGee: Tagging" (2013)

Installation view of "Barry McGee" at the Berkeley Art Museum and Pacific Film Archive (BAM/PFA), 2012
Production still from the "Exclusive" film, "Barry McGee: Tagging," 2013

"That's immediately how I gauge how healthy a city is—by the amount of tags. It's just in direct competition with advertising. It's still one of the last things that hasn't been corrupted."
—Barry McGee

WATCH: Barry McGee: Tagging